MPI_Comm_size -- Environment Inquiry
This returns in integer size number of processes in given communicator comm (remember this specifies processor group)
For C: int MPI_Comm_size(MPI_Comm comm,int *size)
For Fortran: call MPI_COMM_SIZE (comm, size, mpierr)
- where comm, size, mpierr are integers
- comm is input; size and mpierr returned